<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader v-model="selectedCateKeys" :options="catelist" :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children', chrckSrictly: true}" @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">动态参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">静态属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog :title=" '添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClose">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
      <el-button @click="addDialogVisible = false">取 消</el-button>
      <el-button type="primary" @click="addParams">确 定</el-button>
    </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
     <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //商品分类列表
      catelist: [],
      //级联选择框的配置对象
      value: "cat_id",
      label: "cat_name",
      children: "children",
      //级联选择框双向绑定的数据
      selectedCateKeys: [],
      //被激活的页签的名称
      activeName: "many",
      //动态参数的数据
      manyTableData:[],
      //静态参数的数据
      onlyTableData:[],
      // 控制添加对话框的显示与隐藏
      addDialogVisible:false,
      //控制修改对话框的显示与隐藏
      editDialogVisible:false,
      //添加参数的表单数据对象
      addForm:{
        attr_name:''
      },
      //修改的表单对象
      editForm:{
        
      },
      // 修改表单的验证规则对象
      editFormRules:{
        attr_name:[
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ]
      },
      // 添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          { required: true, message: '请输入参数名称', trigger: 'blur' },
        ]
      },
      // // 控制按钮与文本框的切换显示
      // inputVisible:false,
      // // 文本框中输入的内容
      // inputValue:''
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }
      this.catelist = res.data;
      console.log(this.catelist);
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    //tab 页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
  //获取参数的列表数据
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys.length = [];
        this.manyTableData=[]
        this.onlyTableData=[]
        return;
      }
      //根据所选分类Id,和当前所处面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,{ params: { sel: this.activeName}});
      if (res.meta.status !== 200) {
      return this.$message.error("获取参数列表失败！");
      }
      // 获取Tag的数据分割为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本框的显示与隐藏
        item.inputVisible=false
        // 文本框输入的值
        item.inputValue=''
      })
      console.log(res.data);
      //  证明选中的是三级分类
      console.log(this.selectedCateKeys);
      if(this.activeName ==='many'){
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
    },
    //监听对话框的关闭事件
    addDialogClose(){
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮，添加参数
    addParams(){
      this.$refs.addFormRef.validate(async valid =>{
        if(!valid) return
        const{data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if (res.meta.status !==201) {
          return this.$message.error('添加参数失败！')          
        }
        this.$message.success('添加参数成功！') 
        this.addDialogVisible=false
        this.getParamsData()
      })
    },
    //点击按钮展示修改对话框   
    async showEditDialog(id) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { attr_sel: this.activeName }
      })
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮修改参数信息
    editParams(){
    },
    //点击按钮，修改参数信息 预校验
    editParams(){
      this.$refs.editFormRef.validate(async valid=>{
        if(!valid) return 
        const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{attr_name:this.editForm.attr_name,attr_sel:this.activeName})
        if (res.meta.status !==200) {
          return this.$message.error('修改参数失败！')                   
        }
        this.$message.success('修改参数成功!')
        this.getParamsData()
        this.editDialogVisible=false
      })

    },
    // 根据Id删除对应的参数项
    async removeParams(attr_id){
      const confirmResult =await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        if (confirmResult !=='confirm') {
          return this.$message.info('已取消删除!')
        }
        // 删除的业务逻辑
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !==200){
          return this.$message.error('删除参数失败!')
        }
        this.$message.success('删除参数成功!')
        this.getParamsData()
    },
    // 文本框失去焦点，或按下Enter 都会触发
    async handleInputConfirm(row){
      console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputVisible=''
        row.inputVisible=false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputVisible=''
      row.inputVisible=false
      //需要发起请求保存这次操作
      this.saveAttrVals(row)
    },
    // 将对attr_vals 的操作，保存到数据库
    async saveAttrVals(row){
      //需要发起请求保存这次操作
      const {data:res}=await this.$http.put(`categories/${this,this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status !==200){
        return this.$message.error('修改参数项失败!')
      }
      this.$message.success('修改参数项成功!')
    },
    // 点击按钮 展示文本输入框
    showInput(row){
      row.inputVisible=true
      // 让文本框自动获得焦点
      //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除对应的参数可选项
    handleClose(i,row){
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //  如果按钮需要被禁用返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //动态计算标题的文本
    titleText(){
      if(this.activeName==='many'){
        return '动态参数'
      }
      else {
        return '静态参数'
      }
    }
  },
};
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 150px;
}
</style>